Add HedgedRequestsChangeReplica Event and Update Read Data Timeout Format

Why it matters

This feature provides improved observability by introducing the HedgedRequestsChangeReplica profile event, which helps track changes in replica selection during hedged requests. Changing the read data timeout unit to milliseconds allows for more precise timeout control, enhancing the responsiveness and fine-tuning of read operations.

How to use it

Users can monitor the new profile event HedgedRequestsChangeReplica to gain insights into replica switching behavior during hedged requests. To benefit from the more granular timeout, specify read data timeouts in milliseconds in the appropriate settings or configuration files.